some words here on the TQP7M9103. I got my driver board today, which claimed 16dB Gain and 29dBm P1dB. From the datasheet, it was obvious that this cannot be given over the full frequency range as the Qorvo device needs a bit of matching at the input and output.

First measurements: 6dB gain and ca. 20 dBm P1dB. I suspect therefore that this could be improved with some snowflaking (Faehnchenschieben) and as this is low enough power to be safe, I'll go for it

The output inductance (L1) for the bias supply also seemed a bit large to me (too low SRF) so I exchanged it to a part with known parameters (22nH, 0603, 4.6GHz SRF) but this improved matters only little. Will try some snowflaking over the weekend.

Rather interestingly I purchased a similar board a while back and was less lucky. It was labelled as 50Mhz - 4GHz and when I tested it at 2.4GHz I discovered that I had actually purchased an active short circuit i.e. it consumed 100mA and had no gain! The device was labelled as a Qorvo SPF5189Z but for sure was not.

I take the view with the Chinese modules that you pay your money and take a chance, thus far I have been more lucky than unlucky so with this I just smile and carry on. I will put a 'real' device in it one day

Clive, this design from DB4UM needs to be pinned. high gain and decent output power, excellent.

Achim, it's $9.70 for three if you can wait for the slow delivery. With Fedex it's about $33. For three four layer boards that's not bad. Only slight hiccup is that it will need hotair or an oven to solder which may make it difficult for some. Will leave it to you to do any pinning in the forum as I haven't a clue how to. It would be nice if it had a SAW on the front end but it does roll off.

hello everybody I tried 3.5 m of h155 cable with two bnc that I loss 0.37 @2400

Roberto

With all due respect, I doubt this value as no datasheet of the various H155 variants suggests an attenuation of <0.1dB/m @2400 MHz. BNC is not optimal as well on 13cm, but this is another issue. My point is that the H155 cable is a 5-6mm OD cable and even a 1/2 inch cellflex coaxial cable (LCF12-50) only reaches 0.11dB/m.

That said, 1dB difference is barely noticable in daily life unless you have QRO amplifiers or cable in front of the LNA

With all due respect, I doubt this value as no datasheet of the various H155 variants suggests an attenuation of <0.1dB/m @2400 MHz. BNC is not optimal as well on 13cm, but this is another issue. My point is that the H155 cable is a 5-6mm OD cable and even a 1/2 inch cellflex coaxial cable (LCF12-50) only reaches 0.11dB/m.

That said, 1dB difference is barely noticable in daily life unless you have QRO amplifiers or cable in front of the LNA

Thanks and a cable that I had at the station yes, I do not like the optimal bnc are definitely N the size I made with a directional coupler and an hp436a bolometer and a hp8673d signal generator these are my means of availability

Thanks and a cable that I had at the station yes, I do not like the optimal bnc are definitely N the size I made with a directional coupler and an hp436a bolometer and a hp8673d signal generator these are my means of availability

thanks again for the advice

for amp I am experimenting with rf126 1 watts followed by draiver vna25 with input +10 dbm I have to print the pcb